The Fundamentalist Latter Day Saints (FLDS) are an offshoot sect of the Mormon Church who practice polygamy. Aside from the moral issues, polygamy has a simple mathematical flaw: There are not enough females for the males. Sons of Perdition, directed by Tyler Measom and Jennilyn Merten, tells the story of what happens to the teenage boys of Colorado City, Utah, who are expelled from their families because they threaten the older men’s hold on the young women. Mostly, these youth start anew in nearby St. George, but without family, education or training, the challenges are enormous. Fortunately, they have each other, and a web of support has started in St. George for these lost boys. We see their deep determination to create a new life for themselves, different than the medieval one from which they were exiled.